Stiff Person Syndrome: A Case Study

Original Editor - Cassandra Bodrucky, Kathleen Li, Benjamin Prance, Joseph Balasundaram as part of the Queen's University Neuromotor Function Project Top Contributors - Cassandra Bodrucky, Nupur Smit Shah, Kathleen Li, Joseph Balasundaram, Benjamin Prance and Kim Jackson

Introduction

Stiff Person Syndrome (SPS) is a rare neurological condition in which the rate of diagnosis is approximately 1 diagnosis for every 1 million people . The low occurrence of the condition may contribute to there being limited research in regard to the effectiveness of a physiotherapy intervention. In individuals who have SPS it is typical to present with a hyper-lordodic posture, rigidity, and fluctuating muscle spasms . The symptoms typically have an insidious onset with increased tone starting in the paraspinals, proximal lower extremities, and abdominal muscles . Individuals with SPS may also present with episodic spasms particularly in the lower limbs that may also have an associated trigger . The spasms may also cause the patient to fall like tin-man . The typical differential diagnosis for SPS may differ from patient to patient as symptoms vary but it may include: Multiple sclerosis, Parkinson’s disease, or psychiatric disorders secondary to phobias and emotional triggers.

In a case reported by Hegyi in 2011, a 24 year old woman who had also been diagnosed with SPS for approximately one year. In Hegyi’s report, the patient attended 17 sessions across 15 weeks of outpatient physio. The chief concerns of the patient were pain, muscle spasms, gait anomalies and ROM deficits particularly in the left lower extremity. In this case, the patient’s physiotherapy interventions were guided to treat for pain, muscle spasms, gait and range of motion. The particular interventions used were therapeutic ultrasound, soft tissue mobilizations, manual stretching, therapeutic exercise, and fitting for an ankle-foot orthoses. It was found these interventions were successful and improved the symptoms treated.

In a case reported by Potter in 2006, a 33 year old man was being treated in in-patient physiotherapy for 10 days. This man had been diagnosed with SPS for 3 years prior to the recorded physiotherapy intervention. The man presented with decreased static and dynamic balance in standing that was indicated by requiring a rollator walker to ambulate short distances and only being able to maintain a standing position with no handheld supports for 5 seconds . When required to ambulate, the man typically used a wheelchair. The patient also presented with axial rigidity, hyper-lordosis, and bilateral lower extremity rigidity . During the patients past medical history it was indicated that he had suffered from anxiety, depression, substance abuse and chronic bronchitis. The patient also had pain that ranged from 4/10 in quiet sitting that could reach 10/10 depending on the circumstances.

The patient averaged 45 minutes a day of physiotherapy for 10 days with treatment focused on improving functional independence and basic motor skills. The physiotherapy consisted of therapeutic exercises and functional retraining. The patient was given a home exercise program that focused on stretching his lower extremities and flexion based truncal exercises. Although the physiotherapy treatment was scheduled for a longer period, the patient requested early discharge and it was still found there were improvements in his functioning. In this case by Potter in 2006 the patient appears to have a much more progressed case of SPS compared to our patient who will be explored below. However, the goals and physiotherapy management are still similar and will apply in our case. We can use this case to support the efficacy of the physiotherapy techniques used in the case of a patient with SPS which has been questioned before .

In the case to be discussed we will refer to our patient as “Mr. Reed”. Mr. R is a 75 year old man who was diagnosed with classical SPS approximately one year ago. Mr. R presents increased axial stiffness, and bilateral lower extremity stiffness, with his right side more affected compared to his left lower extremity. Mr. R presents with hyper-lordosis, low back pain, hypertonic trunk musculature and hypertonic lower extremity musculature. Although SPS is a rare neurological disorder and there is limited evidence regarding the efficacy of physiotherapy as a treatment, the two cases above support the indication of physiotherapy for Mr. R’s case. The objectives of this case study to provide more information and literature regarding the efficacy  of physiotherapy applied to an individual with SPS in an outpatient setting.

Client Characteristics

Mr. Reed is a 75-year-old male. He is a retired data analyst, who lives at home with his wife in Kingston, Ontario. Mr. R began noticing he had decreased balance two and a half years ago with increased amounts of falls (last fall ~two weeks ago) which has progressively gotten worse with low back pain starting a year and a half ago. Within the last year, he noticed increased pain in his lower extremities with muscle spasms particularly affecting the left leg. He was referred to a neurologist and diagnosed with SPS. He received a referral for outpatient physiotherapy to perform a falls risk assessment, help with his balance and gait, manage muscle rigidity and spasms, and maintain his independence and quality of life.

Examination Findings

Subjective

• Patient Profile (PP): 75 y/o male, right hand dominant
• History of Present Illness (HPI): diagnosed with stiff person syndrome 1 year ago, left plantar flexor contracture (~2 months), muscle spasms, and progressive rigidity (~ 1 year) and lower extremity pain (~6 months), chronic low back pain (~1.5 years).
• Past medical history: Type 1 diabetes, hypertension, high cholesterol.
• Medications: Oral diazepam, gabapentin (1), and insulin
• Health Habits: Non-smoker, drinks occasionally (~2 drinks a week).
• Psychosocial: The patient describes feeling lonely due to COVID-19 as well as frustrated with the diagnosis. Over the past 6 months, he has avoided gardening and groceries due to feeling unsteady and having a fear of falling. He lives with his wife and his son lives 20 minutes away and visits weekly where his daughter lives 1 hour away and visits monthly.
• Home: Bungalow, 5 stairs into the home with railings on the right at both front and back door. The bathroom has a stand-up shower with railings.
• Previous Functional Status: Able to ambulate more than 200m with no gait aid, active in gardening and golfing, no issues performing activities of daily living (ADLs)  
• Current Functional Status: Less confident walking outdoors, feeling unsteady, rigidity and painful spasms in both lower extremities prevented him from engaging in his hobbies (gardening, watching golf, sailing)
• Imaging/Diagnostic testing: MRI and X-ray for chronic low back pain (all negative), Blood tests (Anti-GAD body 92.5 units/mL), nerve conduction studies (No abnormalities)
• Precautions/Contraindications: None
• Chief complaint: decreased balance control, increased rigidity and painful spasms in lower extremities particularly in the left leg limiting his ability to do ADLs.

Objective

General

• Vital signs
  • Pulse 80bpm, BP 145/95mm HG, RR 15 bpm
• Pain
  • Visual analogue scale
    • 3/10 constant pain in the lower back
    • 4/10 during painful spasms in the right lower extremity, due to hot weather and stress
    • 7/10 during painful spasms in left lower extremities, due to hot weather and stress

Posture

• Thoracic kyphosis
• Hyper-lordosis

Gait

• Slow and wide gait, appears to walk stiff legged
• Left ankle stiff and lack dorsiflexion, than right LE
• Max walking distance 200m  
• Typically ambulates with a 4WW outdoors and single cane indoors  
• Shuffling
• Decreased arm swing

Tone

• Increased tone in the lower extremities, more increased tone on the left
• Mild plantar flexion contracture, as well as lack of knee extension

AROM

• Knee flexion (right 135°, left 120°)
• Knee extension (right -10°, left -20°)  
• Ankle dorsiflexion (10° right, left -5°)
• Ankle eversion  (10° right, left 5°)
• All other ROM within normal limit (WNL)

PROM

• Knee extension (right -5°, left -10°)
• All other ROM within normal limit (WNL)

Clinical Impressions

The patient is a 75 year old male with mild SPS. His subjective interview indicates that initially in his diagnosis he was able to participate in his regular ADLs but for six months now has avoided doing his regular ADLs due to feeling unsteady, having progressive rigidity and having a fear of falling. Major clinical findings from the objective assessment revealed: hyper-lordosis, mild left plantar flexor contracture, lack of ROM in his ankles and knees. His left ankle dorsiflexion and knee extension are particularly affected, he also presents with chronic low back pain, rigidity, painful muscular spasms in lower extremities (left affected more than right), and decreased trunk and lower extremity strength.

His self reported ABC score was 50% indicating that he is moderately confident with his balance and has a fear of falling . This finding indicates that his lack of participation in his ADLs is mostly due to his lack of confidence and is at a fall risk .

The patient's lower extremity and trunk strength may also be a factor impending his balance. His trunk impairment score was 10/23, indicating that his siting static and dynamic balance is poor . His BBS score is 40 which indicates that he is at an increased risk for falls (<45 indicates increased risk of falls) . His TUG score is 30s indicating that he is at an increased risk of falling (normal for his age is 9s+/- 3s) . His RMI score is 7/15, a higher score would indicate he has better mobility performance . These findings indicate a need to include balance, gait intervention, and reassessment of appropriate gait aids in his treatment plan due to his overall increased risk of falls.

Mr. Reed's health prior to the diagnosis of SPS was fair as he had type 1 diabetes, hypertension and high cholesterol. However, he did partake in some activities and was relatively active for his age. His activities have been limited for six months now by his fear of falling, progressive rigidity and painful spasms in the lower extremities with his left side being worse than his right. It is believed that Mr. R would be a good candidate for physiotherapy to assist with improving his confidence, balance, and strength while reducing his muscle rigidity. Furthermore, Mr. R’s care should extend to a multidisciplinary approach which will be explored later in this case.

Problem List

1. Decreased balance
2. Decreased confidence and increased fear of falling
3. Hypertension
4. High cholesterol
5. Type 1 Diabetes
6. Lower back pain
7. Lower extremity pain (due to muscular spasms)
8. Decreased left ankle dorsiflexion and eversion ROM
9. Mild ankle plantar flexor contracture
10. Decreased left knee flexion and knee extension ROM
11. Kyphotic posture in thoracic spine
12. Hyper-lordosis in lumbar spine
13. Decreased lower extremity strength
14. Rigidity
15. Hypertonia
16. High Anti GAD levels
17. Abnormal gait

Intervention

Short term goals

1. Improve his ABC score from 50% to 64% in 6 weeks
2. Decrease his lower back pain from a 3/10 to a 1/10 at rest in 5 weeks
3. Decrease his pain from muscle spasms from a 7/10 to a 4/10 in the left leg and a 4/10 to a 2/10 in the right leg, in 5 weeks
4. Increase his left ankle dorsiflexion ROM from a -5° to a 0° in 6 weeks
5. Increase his left ankle eversion ROM from 5° to 8° in 6 weeks
6. Increase his knee extension AROM from -10° to -5° on the right and -20°to -15° on the left in 5 weeks
7. Increase his left knee flexion ROM from 120° to 127° in 6 weeks
8. Improve his lower extremity strength from a 4/5 to a 5/5 on the right and a 3+/5 to a 4/5 on the left side in 6 weeks
9. Improve his TUG score from 30 to 18 in 6 weeks
10. Improve his trunk impairment score from a 10 to 15 in 6 weeks

Long term goals

1. Improve his BBS from 40 to 47 in 16 weeks
2. Improve his RMI score from 7 to 12 in 16 weeks
3. Walk around the block with his wife with improved gait mechanics in 16 weeks
4. Be able to garden for 30 minutes a day in 16 week

Treatment Plan

The following exercises were not completed in one session but exercises used throughout the 16 week, treatment session as the patient progressed. These exercises should be performed with caution in order to prevent muscle spasms.

	Frequency	Intensity	Time	Rationale
Education Role of PT Pain management Environmental modifications Appropriate use of gait aids	During his initial appointment and then in subsequent check-ins	N/A	Ongoing	Problem List (6,7,17) To make sure the patient understands the role of the physiotherapist, how to manage his symptoms and what needs to be done in order to see improvements.
Balance training Standing shoulder width apart Eyes open Eyes closed Foam surface Standing tandem stance Stand heel toe Picking up objects off the floor Perturbations Forewards Backwards Sideways Turning around (360s) in parallel bars	In clinic: 2x/week for the first 8 weeks then progressing to 1x/week At home: 2x/week at home for the first 8 weeks then progressing to 3x a week at home	As tolerated, but actively trying to push past limits	Initially 15 minutes a day then progressing to 30 minutes	Problem list (1,2) Increase Mr.Rs confidence with his balance and decrease his risk of falls.
Gait Walk with nordic poles Parallel bar walking Forewards Backwards Sideways Over obstacles	In clinic: 2x/week then progressing to 1x/week At home: walking with nordic poles 3x a week then progressing to 4x/week at home	Light intensity	10 minutes initially the progressing to 15 minutes	Problem list (1,2,17) Improve Mr. Rs gait mechanics, walking endurance (20) as well as increase his confidence and decrease his risk of falls.
Strengthening Kitchen sink exercises Isometrics Quadriceps Calves Hamstring Postural strengthening/motor control Sit to stand Step-ups in parallel bars   Kneeling to standing and vice versa	At home: 3x/week In clinic: 2x/week then progressing to 1x/week	65%of 1RM/light intensity Light intensity	3 sets of 12 reps 2 sets of 15 reps	Problem list (11,12,13,15) Postural strengthening  and motor control are a key portion of both gait and balance, therefore taking steps to improve Mr.R posture/motor control will help improve his gait and balance furthermore Strengthening of the lower extremity will lead to improvements in balance and gaits. As such, strengthening these will allow Mr. R to return to his ADLs at a quicker pace.
ROM Trunk Hip Knee Extension Flexion Ankle Dorsiflexion General ROM with stationary bike	At home: 3x/ week progressing to 6x/week In clinic: 2x/week then moving to 1x/week	Light pressure to start then proceeding moderate. Stretching to the point of slight discomfort and when you feel a stretch Light intensity	30s static stretch repeated twice a day For 5-10 minutes before ROM exercises	Problem list (8,9,10,14,15) Improvement of his ROM will translate to better gait and balance and as such will speed up his ability to participate in his ADLs.
Additional treatments Soft tissue mobilizations of lower back and lower extremity muscles Joint mobilizations of lower extremity joints Heat therapy	In clinic: 2x/week moving to 1x/week Heat therapy as needed at home	5-10 Passes As tolerated	Ongoing 10 minutes 3 times a week	Problem list (8,9,10,14,15) Improve his muscle extensibility and joint mobility allowing for improvements in Mr.Rs overall mobility.

Interprofessional Health Team

It is important to include a variety of healthcare professionals in Mr. R’s care plan. For instance, his family physician plays a crucial role in managing his acute and chronic conditions and determining other underlying conditions he may have . As well, family physicians are one of the first point of contact in the healthcare system and can refer to other specialists when needed. Neurologists are also vital in Mr. R’s care as they are specialized to diagnose, treat, or manage Stiff Person Syndrome. They could prescribe the appropriate medication to manage his symptoms, perform tests such as nerve conduction studies and electromyography to evaluate the integrity of the nervous system as the condition progresses, and provide appropriate interventions to manage the condition when needed.

In addition to his family physician and neurologist, there are other professionals that need to be involved. Considering Mr. R’s age, high-cholesterol and type 1 diabetes, it was viewed as essential that he was referred to a dietitian. Considering Mr. R’s comorbidities, and complexity as a case, a professional opinion was required. A dietitian can provide vital advice to assist Mr. R with his self management of his diabetes and high cholesterol which can assist in reducing long term complications commonly involved with diabetes and also improve his quality of life .

A  social worker may also be included in his plan of care, as they can provide resources and services to overcome barriers with regards to aspects such as psychosocial, physical, and emotional well-being . In Mr. R’s case, a social worker may direct him to appropriate resources as he reported feeling socially isolated due to COVID and frustrated with his diagnosis. A social worker may also help implement interventions to prevent caregiver burden that his wife may experience if Mr. R’s condition was to progress.

As well, an occupational therapist may be included to help enhance Mr. R’s quality of life and become more independent with his ADLs. They can provide assessments to determine whether adaptive equipment or home modifications are needed as his physical ability changes . Furthermore, they can determine if appropriate adaptations should be made or if new skills are to be learned, to allow Mr. R to engage in his gardening hobby, go grocery shopping, or perform his ADLs with ease (30). Occupational therapists could also provide education and guidance to Mr. R’s spouse about how to provide accommodations and care when needed .

Outcome

Based on the initial assessment, it was determined that Mr. Reed should receive four months of physiotherapy to address his impairments and implement a home exercise program. He was seen twice a week for the first eight weeks, and once a week for the remaining eight weeks. He was reassessed at the end of his six month treatment to determine how to proceed with ongoing therapy.  

Major outcomes included: Increased ROM, improved overall balance and confidence, balance control, tone, gait mechanisms and paid reduction/management. While he now feels more confident gardening and walking around the block, he still has mild balance impairments, thoracic kyphosis, rigidity, and mild mobility concerns. His current scores are:

• ABC: 70%
• RMI: 10/15
• BBS: 47
• TUG: 13s
• Trunk Impairment Score: 18/23

After 16 weeks of the prescribed treatment Mr. Reed’s BBS score improved to a 47/56 which indicates a minimal detectable change occurred and along with a decreased risk of falls . His ABS score improved from 50% to 70%, which still leaves him in the moderate level of physical functioning category. However, this change indicates a minimal important difference (range 11-13%) and that he is no longer at a fall risk as his score is above a 67% ,. His TUG score improved to 13s, which further underscores a lower risk of falls and more functional independence ,,. and his RMI score improved to 10/15, indicating better mobility performance , .

Overall, Mr. Reed achieved all his short-term and most of his long-term goals during the 16 weeks of treatment. Mr. Reed’s RMI score improved significantly but did not meet his LTG (b). It was decided at the end of the 16 weeks that the frequency of his visits would decrease to once a month, and additional long-term and short-term goals were set. A one-month follow-up was scheduled to check-in, reassess, and provide progressions to his home exercise treatment plan; this is a progressive disorder and the focus remains on maintenance and continued communication between Mr. Reed’s interprofessional health team.